<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            
            margin: 10px auto ;
            width: 500px;
            height: 300px;
            border: 1px solid #333;
            /* background: url(images/adv-1.jpg) no-repeat top right / 15em 10em,
                        url(images/adv-2.jpg) no-repeat bottom right / 15em 10em,
                        url(images/adv-3.jpg) no-repeat bottom left / 15em 10em; */
            background:url(images/adv-1.jpg) top right,
                        url(images/adv-2.jpg) botton right,
                        url(images/adv-3.jpg) botton left;
            background-size: 15em 10em;
            background-repeat: no-repeat;
        }
    </style>
</head>
<body>
    <div>

    </div>
</body>
</html>